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You may indeed need a permit, but as long as long as it's your house and you live there (single family, not a rental) you do not need to use a licensed plumber.

In my opinion, the best material for this application is type k copper in a continuous roll. It may be more expensive, but you'll never need to touch it again. My second choice would be schedule 40 pvc (pressure rated).

Calling for utility locates is a very good idea. They generally require 72 hour notice.

Good luck, it's a big job.